/*
 * Copyright (c) 2012 Robert Burrell Donkin robertburrelldonkin.name
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
 * and associated documentation files (the "Software"), to deal in the Software without restriction, 
 * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software 
 * is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all copies or 
 * substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * 
 */
package walrus.unpack.xml;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParserFactory;

import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

abstract class DumpLoader extends DefaultHandler {
	
	private final File target;

	private BZip2CompressorInputStream in;
		
	
	public DumpLoader(File target) {
		super();
		this.target = target;
	}
	
	private void open() throws IOException {
		if (!target.exists()) {
			throw new FileNotFoundException("File not found " + target);
		}
		in = new BZip2CompressorInputStream(new FileInputStream(target));
	}
	
	private void parse() throws ParserConfigurationException, SAXException, IOException {
		SAXParserFactory.newInstance().newSAXParser().parse(in, this);	
	}

	private void close() throws IOException {
		if (in != null) {
			in.close();
		}
	}
	
	public void load() throws IOException, ParserConfigurationException, SAXException {
		try {
			open();
			parse();
		} finally {
			close();
		}
	}
	 
}
